49ers sign three guys to get their roster back to 90 players

The 49ers filled their roster back to 90 players by signing three guys Monday, which should cover them until the next wave of retirements. According to Matt Maiocco of CSNBayArea.com, the 49ers signed offensive lineman Ben Gottschalk, kicker Corey Acosta and wide receiver Mario Hull. They made room for the additions by waiving tackle Chris Martin and wide…